…nieklinnenbank#7 nieklinnenbank#9 -- build, shutdown, touch, shell, threading Issue nieklinnenbank#3 -- x86-64 build fix (IntelCore.h) - Replace the 32-bit-only '=A' rdtsc constraint with separate '=a'/'=d' register outputs so the timestamp() function compiles on x86-64. Issue nieklinnenbank#5 -- shutdown command now works (IntelCore.h) - cpu_shutdown() previously only wrote to port 0xB004 (old Bochs/QEMU). Now tries all three known emulator shutdown sequences in order: 1. port 0x604 / 0x2000 (QEMU >= 2.x, ACPI PM1a) 2. port 0xB004 / 0x2000 (legacy QEMU / Bochs) 3. port 0x8900 'Shutdown' byte-string (Bochs/SeaBIOS) Issue nieklinnenbank#9 -- touch creates files on LinnFS (LinnFileSystem) - Add createFile() override to LinnFileSystem so that creat()/open(O_CREAT) calls succeed by creating in-memory PseudoFile/Directory objects. Files are session-local (non-persistent); full on-disk write support remains a future TODO. - Fix description string typo in bin/touch/CreateFile.cpp. Issue nieklinnenbank#7 -- shell forkexec failure for server processes (Shell.cpp) - Guard executeInput() against empty/null argv[0] to avoid potential null-pointer access when parse() produces trailing empty tokens. - Add /server/ as a PATH fallback prefix alongside /bin/ so server process names typed without a full path are also resolved. - Increase path scratch buffer from 128 to 256 bytes. Issue nieklinnenbank#6 -- kernel threading support - Add SpawnThread to ProcessOperation enum (ProcessCtl.h). - Implement ProcessCtlHandler case for SpawnThread (ProcessCtl.cpp). - Add ProcessManager::createThread() which creates a schedulable Process sharing the caller's MemoryContext (ProcessManager.h/cpp). - Add Process::m_isThread flag; destructor skips shared-context free when true to prevent double-free (Process.h/cpp). - Extract Process::initializeKernelChannel() so threads can reuse the kernel-event-channel setup without re-creating a MemoryContext. - Add thread_create() / thread_exit() to libposix (unistd.h + unistd/thread_create.cpp) backed by the new SpawnThread syscall.

Request: LinnFS write support, Threading support #6

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